Computer-implemented method for establishing a VOIP communication

Abstract

A computer-implemented method for establishing a VOIP communication between a PBX system and a first terminal device is disclosed. The first terminal device has a VOIP application or video call application. The PBX system and the first terminal device are able to communicate via a first communication connection and a second communication connection. When the PBX system receives a call to be forwarded to the first terminal device the PBX system verifies whether the first terminal device is logged in. If the PBX system verifies that the first terminal device is not logged in, the call is rejected. If the PBX system verifies that the first terminal device is logged in, the PBX system determines whether the application on the first terminal device is running in a background mode or in a foreground mode. When the PBX system determines that the application is running in the foreground mode, the PBX system uses the first connection for forwarding the call. When the PBX system determines that the application is running in the background mode the PBX system uses the second connection to receive information about the communication connection being used.

Description

FIELD OF INVENTION[0001]The present invention is relates to a computer-implemented method for establishing a VOIP communication between a PBX system and a first terminal device in a communication network, a Private Branch Exchange (PBX) system, and a communication network.BACKGROUND OF THE INVENTION[0002]Telephony, like voice or video communications, nowadays may be performed via the Internet which, in particular, for long-distance calls may be very cost-saving and economical compared to regular landline networks, like for example, Integrated Services Digital Network (ISDN), since so-called the Voice over Internet Protocol (VOIP) allows voice communications, video communication, or multimedia sessions of Internet Protocol (IP) networks, such as the Internet. With increasing use of Internet telephony, PBX development is directed more and more to using the Internet Protocol for carrying out calls.[0003]Therefore, in prior art, PBX systems which are adapted for connecting to terminal d...

AI Technical Summary

Benefits of technology

The patent text describes a PBX system that allows a phone system to communicate with a computer device using a web-based connection. This allows for more efficient and secure communication between the two devices. The preferred connection is made using HTTP,Socket, or WebSocket Protocol. The technical effect of this invention is to provide a more robust and reliable communication network using a PBX system and a computer device.

Problems solved by technology

However, there cases may occur when the VOIP application is paused after a while meaning that the application is moving from a foreground mode to a background mode.

For example, this may be necessary in such cases, where the VOIP application is not registered with the PBX system, or the VOIP application is not allowed to register with the PBX system, because it tries to connect from a WAN / GSM network which is not considered to be secure or trustworthy by the PBX system or the mobile device.

Another case may be that the PBX system does not allow VOIP calls from applications that do not support specific codecs, such as G.722.

However, when a user's mobile device changes network and moves, for example, from a WAN to a GSM network while the VOIP application is in the background mode, then a problem occurs for the PBX system which at that time is not connected to the VOIP application and thus, when receiving an incoming call to be forwarded to the mobile device, does not “know” whether or not it can reach the mobile device, if it should send a remote notification with a call message, or if it should act differently, like, e.g., deflecting the call to Voice Mail or to a GSM call.

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